I have read on some other websites that the 1/4 glass from a Cuda hardtop is different than the convertible. I have both setups and the glass is identical in shape and arc. I know the regulators have a notch in the teeth for the convertibles, and there is a slight variation from 70-71 in the cast aluminum bracket that holds the glass as well as the stainless channel that holds the weatherstrip.Anyone have any info please school me.